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17 Cards in this Set

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Newton's first law of motion (the law of inertia)
Every object continues in its state of rest, or of uniform motion in a straight line, unless compelled to change that state by forces impressed upon it
Inertia
The property of things to resist changes in motion
Force
In the simplest sense, a push or a pull
Net Force
The vector sum of forces that act on an object
Mechanical Equilibrium
The state of an object or system of objects for which there are no changes in motion. In accord with Newton's first law, if at rest, the state of rest persists. If moving, motion continues w/o change
Equilibrium rule
For any object or system of objects in equilibrium, the sum of the forces acting equals zero. In equation for EF=0
Speed
How fast something moves; the distance traveled per unit of time
Velocity
The speed of an object and a specification of its direction of motion
Vector quantity
Quantity in physics that has both magnitude and direction
Acceleration
The rate at which velocity changes with time; the change in velocity may be in magnitude, or direction, or both
Free Fall
Motion under the influence of gravity only
Speed
D/T interval
Average speed
total D covered/T interval
Acceleration
change of V/T interval
Acceleration (along a straight line)
change in S/T interval
Velocity acquired in free fall from rest
V = gt
Distance fallen in free fall, from rest
D=(1/2)gt^2